Originally Posted by
jamiel
If you're in the southwest, check out leaving from Tijuana (you can use the Cross Border Xpress). TIJ-MEX-MAD/CDG/AMS/LON and reverse.
This is the way - departure from Mexico is priced materially lower than US/Canada from everything I have seen. Example: I was able to find AF J next December for 75000 SkyMiles for MEX-CDG.